Tough question. Every situation has its own methods, and some countries or localities specifically prohibit exclusivity.

In general, a producer requires a certain volume commitment, which of course is dictated by how much the producer has to sell to your particular market. The only way to go about it is to make visits to wine trade events, taste the wines, select the ones you are interested in representing and then negotiate a deal with the producer, after you acquire licenses to deal in wine relevant to Swedish regulations.